import java.util.*;
public class Example3_9{
	public static void main(String args[]){
		Scanner reader = new Scanner(System.in);
		double sum=0;
		int m=0;
		while(reader.hasNextDouble()){
			double x = reader.nextDouble();
			m++;
			sum+=x;
		}
		System.out.printf("%d个数的和为%f\n",m,sum);
		System.out.printf("%d个数的平均值是%f\n",m,sum/m);
	}
}
